MathDB

P1

Part of 2020 Iran MO (2nd Round)

Problems(1)

Find the min number of partition

Source:

7/14/2020
Let SS is a finite set with nn elements. We divided ASAS to mm disjoint parts such that if AA, BB, A∪BA \cup B are in the same part, then A=B.A=B. Find the minimum value of mm.
combinatoricsSet systemsEnumeration